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Table I -Groundwater Monitoring and Chemical Analytical Results Tosco(76) Scn`ice Station No11 192 1403 Counuti C'luh Boulcvurd Stockton.California SPH Sample TOC DTW' Thickness GWE TPHg B T F, X MISE DIPE ETBE TAME TBA Ethanol 1,2-DCA 1,2-DBA Sample ID Date (feet) (feet) (feet) (feet) (ppb) (ppb) ( rb) (pill]) (ppb) (ppb) (ppb) (ppb) b) gib) (ppb) ( b) 1 fh) MW-1 11,3,'2[)03 5,00 14.59 0,00 -9.59 <:250 <2.5 <2,5 3.9 8.0 210 -10 <10 <10 <10 <2.500 <10 <10 MW-3 1'3;2003 5.68 13.36 (UM -9.68 <1(,000 <100 <100 <100 2200 <400 <400 <400 <400 150,0E+0 <100.000 <400 r<400 MW-4 1/.3/2003 6.21 15.79 0.00 -9.58 <50 <0.50 <0.50 <0.50 <1.0 130 <2.0 <2.0 22.0 2101) <500 4.0 <2.0 MN4'-5 1131200_, 5.63 15.23 0.00 -9.60 <50 <0.50 <0.50 <O.50 <1.0 <2.() <2.0 <2.0 <2.0 2100 <500 <2.0 <2.0 MW-6 113/2003 5,28 14.75 0.00 -9.47 <50 <O.50 <0.50 0.65 2.1 <2.0 <2.0 <2.0 <).0 <10I1 <500 <2.0 210 MW-7 1/3/2003 5.69 1538 0.00 -9.69 <10.000 <100 2100 -100 2200 <400 <400 <400 <400 140,000 <I00.Oi)0 <400 <400 MW-8 1/3!2003 4.79 14.22 0.00 -9.43 <50 <0.50 <0.50 <t1.5(1 <1.0 <2.0 <2.0 <2.0 4.0 <100 <500 <2.0 <2.0 MW-9 1/3/2003 4.26 1420 0.00 -9.94 <50 <€3.50 -'0.50 2.0.50 <1.0 <2.0 <2.0 <2.0 <20 <100 <500 <2.0 Q.0 MW-10 1/3/2003 4,06 13.79 0.00 -9.73 <50 <0.50 <0.50 20.50 <L0 <2.0 <2.0 <2.0 <2.0 <100 <-500 <2.O <2.0 MW-Il P3/2003 5.18 18.81 0.00 -13.63 <50 20.50 0.52 <0.5(1 <L0 130 <2.0 <2.0 <2.0 150 <501) 7,2 <2.0 MW-12 1/7!2003 6.42 15.08 0.00 -8.66 <250 <2.5 <:2.5 <2.5 25.0 220 <10 <10 <10 1,700 0.500 <10 <10 Mho"-13 1/3/2003 4.38 14.27 0.00 -9.89 25.000 <50 <50 <50 <100 13,000 <200 <200 <200 20,000 <50000 2200 <200 EXPLANATION Icet tcet bclo% ground surface MtBF _ Mcthyl tort-Butyl Ether Analytical Laboratorv: SPI I == Separate Phase 1kdrocarhons DIPf.=Di-isoprop�I Ether Severn'll•ent I..ahoratories. Inc..Pleasanton_CA (E].AP#2496) TUC = Top of Casing elevation 1"I'13F Ethv1 Tort-ButsI lather D_FVV==Depth to Water "DAME= Tert-A€n�I Methyl I:'"ther Analytical Methods: GWE ciroundwater]Jcvation TBA =Te€A-Butll Alcohol TPI lal,B'l I.?CIMtBE/ETBE/DIPF/TA MI:111 A,1ethanoFl-2-DCA 1.2-DI3A by ETA Method 8260B ppb =° parts per billion I,2-DCA 1,2-Dichloroethane TPI I,- Yotal Petroleurn 111drocarbons as gasoline 1,2-DBA= 12-Dihromoethane(I-D13) B = Benzene "Y = Toluene Notes I?= Ethylben7enc Well elevations repo€led as"RK'surge}°ed h} Virgil Chavez Land Sur�v�ing,licensed California Land Surveyor No.6323. X =="Total Xylenes 140245^" Page 1 of 1